B2.Fixture

Supported platforms:
Available since: Gideros 2011.6

Description

A fixture is used to attach a shape to a body for collision detection. A fixture inherits its transform from its parent. Fixtures hold additional non-geometric data such as friction, collision filters, etc.

Fixtures are created via b2.Body:createFixture.

Examples

Example of fixtures collision filtering

local BALL_MASK = 1
local CRATE_MASK = 2
local WALL_MASK = 4
 
-- ball
local body = world:createBody{type = b2.DYNAMIC_BODY}
local circle = b2.CircleShape.new(0, 0, radius)
local fixture = body:createFixture{shape = circle, density = 1.0, 
friction = 0.1, restitution = 0.2}
-- ball will collide with other ball and wall
fixture:setFilterData({categoryBits = BALL_MASK, maskBits = BALL_MASK + WALL_MASK, groupIndex = 0})

local body = world:createBody{type = b2.DYNAMIC_BODY}
local poly = b2.PolygonShape.new()
poly:setAsBox(width, height)
local fixture = body:createFixture{shape = poly, density = 1.0, 
friction = 0.1, restitution = 0.2}
-- crate will collide with other crate and wall
fixture:setFilterData({categoryBits = CRATE_MASK, maskBits = CRATE_MASK + WALL_MASK, groupIndex = 0})

local body = world:createBody{type = b2.STATIC_BODY}
local chain = b2.ChainShape.new()
chain:createLoop(
	0,0,
	application:getContentWidth(), 0,
	application:getContentWidth(), application:getContentHeight(),
	0, application:getContentHeight()
)
local fixture = body:createFixture{shape = chain, density = 1.0, 
friction = 1, restitution = 0.3}
-- walls will collide with both balls and crates
fixture:setFilterData({categoryBits = WALL_MASK, maskBits = CRATE_MASK + BALL_MASK, groupIndex = 0})

Methods b2.Fixture:getBody returns the parent body of this fixture b2.Fixture:getFilterData returns the contact filtering data b2.Fixture:isSensor is this fixture a sensor (non-solid)? b2.Fixture:setFilterData sets the contact filtering data b2.Fixture:setSensor sets if this fixture is a sensor

Events Constants

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• LiquidFun